A lot of people on here share your idea. When I first got my 330i, I was unhappy with the ride quality. I was told that was the price to pay for having large rims and a firm, sport-oriented ride.

After my 330i, I got my RS4 and dispelled that myth. Large rims and a firm, responsive suspension don't necessarily lead to a choppy/harsh ride. CA was able to achieve a better balance with non RFT and Koni FSD. So it CAN be done.

Even with stock tires and shocks, my 2009 335 is better than my 2006 330 was. It's only an issue on really bad city roads, so I'm not sure I'll bother with the Koni FSD this time around, but it's nice to know it's an option.

CA is right. 17 or 18" rims actually perform better than 19" rims (according to a rather extensive C&D test a few years back). But if you like the look, get the 19". If you drive on bad roads, you can take steps to improve the ride, if necessary. And I doubt you'll push the car hard enough to see a noticeable drop off in performance.